2009
|
|

Abstract: Platinum(II) complexes of the form [PtL(n)Cl](+) are reported, containing the N--N--N-coordinating ligands 2,6-di(8-quinolyl)pyridine (L(1)), 2,6-di(8-quinolyl)-4-methoxypyridine (L(2)), or 2,6-di(7-aza-indolyl)-pyridine (L(3)). Metathesis of the chloride co-ligand in [PtL(1)Cl](+) can be accomplished under mild conditions, as exemplified by the formation of the complexes [PtL(1)OMe](+) and [PtL(1)(C[triple bond]C-tfp)](+), in which L(1) remains bound as a terdentate ligand {HC[triple bond]C-tfp = 3,5-bis(trif… Show more

Help me understand this report

Search citation statements

Order By: Relevance
Select...
2
1
1
2
51
0

Year Published

2013
2013
2020
2020

Publication Types

Select...
5

Relationship

1
4

Authors

Journals

2
51
0
Order By: Relevance
“…TDDFT calculations predict such a peak to occur at 543 nm. The bismetalated complexes are clearly different than the monometalated cases, probably due to the presence of two strongly donating, rigid, relatively inert, chelate ligands [31]. The complexes showed emission at room temperature when excited at the appropriate wavelength 420 or 435 nm.…”
Section: Table 1amentioning
“…The corresponding trans bite angle of 171.71(5)°in the N^N^O-coordinating ligand is significantly larger, reflecting the fact that one of the two chelate rings formed is six-membered in that case. 25 The Ir-C and Ir-N py bond lengths are similar to those of bis-terdentate complexes incorporating dpyx and terpyridine-based ligands. 16 On the other hand, for the N^N^O ligand, the central Ir-N hydrazone bond is significantly longer than the Ir-N py bond {2.078 1and 2.019(1) Å respectively}; this contrasts with terpyridine complexes where the M-N bond to the central pyridine is normally shorter than those to the lateral pyridines, owing to the constraints of the bite angle.…”
Section: Structural Characterisationmentioning
“…Previous attempts to use 6-membered chelates in Ir complexes have been unsuccessful due to their very low emission quantum yields [30,31]. Similarly, bis-cyclometalated and triscyclometalated Pt(II) complexes containing 6-membered metal chelation rings as part of chromophores have also been explored but exhibit low emission quantum yields in the range of 5% or less while the majority of previously studied molecules exhibit a red emission color due to the choice of ligand design [32][33][34]. The complex described here, on the other hand, forms a 6membered chelation ring with the Pt metal through a carbazolylpyridine (NON) ligand.…”
Section: Introductionmentioning
“…Platinum(II) complexes with chelating aromatic ligands show greater rigidity and dispositions with ideal square‐planar geometry, thus inhibiting the excited‐state distortion that promotes radiationless decay (e.g., D 2 d distortion) 5,2126. It has been demonstrated that the platinum(II) center with a six‐membered chelating ring exhibits a more perfect square‐planar structure than that with a five‐membered chelating ring,2730 and the larger‐sized six‐membered chelating ring could relieve strain so that a ligand field is promoted 31…”
Section: Introductionmentioning
“…ATD-DFT calculation is obtained to rationalize this unique behavior.Square-planar platinum complexesh ave received considerable attentiond ue to their unique photophysical properties. [1][2][3][4][5] Moreover they promote noncovalentm etal-metal and p-p interactions that profoundly impact the properties of the electronic excited states. [6][7][8][9][10] Such compounds have showns uccessfula pplicationsa so rganic light-emitting devices (OLEDs), molecular sensors, and photochromic materials.…”
mentioning